The Study On Reservoir Evaluation And Prediction In Chang 8 Of Shanzhuang Area,Nanliang Oil Field

In recent years, the low-permeability reservoir, which located in Nanliang oilfield, has already become one of the most important exploration and development blocks, and this areas has good prospect with increasing reserve and production. Specially, the oil layer group of chang 8, which is the most important oil-bearing layer of the oilfield in the next future years, is also the key target in the production area. The chang 8 formation is dominated by lithologic reservoir and is abundant in oil and gas resources. While, there are many difficulty problems lead to the unknown direction of oiling productivity construction and expend the degree of difficulty with developing in this regional by the time, such as the unclear understanding of the regularity of sand body distribution, the weak studying of the reservoir and the complicated solution of reservoir in the developing.According to the geological characteristics and development status of the area, the study, analyzing the data of drilling, core and testing, combines macro-analysis with micro-analysis and points out a new orientation in the research with theory application and production practice. The study mainly describes the regional stratigraphic classification and correlation. By the analysis and contrast of sedimentary facies and isopach maps of sandstone, the discovery focuses on the lithological characteristics of reservoir, pore structure, diagenesis, physical properties, heterogeneity and seepage features. By analyzing the characteristics of reservoir, the evaluation standard and dessert in the area was proposed.The study shows that the chang 8 reservoir in the Nanliang oil field is mainly controlled by the southwest source and the sedimentation in the development of shallow-water delta front and shore-shallow lake. The reservoir formation is mainly composed of the grayish green sandstone. Combining the comprehensive evaluation of chang 8 reservoir, it is predicted that there are 12 favorable construction areas in the oilfield, and the geological reserves is estimated 4826×104t. The research also has important significance in development for this kind of low-permeability reservoirs.